Nasdaq 100 and S&P 500 Lose Nearly $3.3 Trillion Amid AI Spending Concerns

The Nasdaq 100 and S&P 500 have collectively lost nearly $3.3 trillion in market value as disappointing earnings reports and soft guidance have triggered a widespread selloff in U.S. stocks. On October 30, 2026, the Nasdaq Composite fell by 3.37%, closing at 25,303.37, while the S&P 500 dropped 2.08% to 7,559.85. This downturn marks a troubling trend for the Nasdaq 100, which is facing its worst performance since mid-June, with losses exceeding 3% as fears surrounding substantial AI-related capital spending continue to grow.

The aggregate loss of nearly $3.3 trillion has unfolded throughout October, with the Nasdaq 100 alone projected to incur a monthly loss of over $2 trillion, primarily driven by apprehensions regarding AI investments. Semiconductor manufacturers and hyperscalers, the large cloud service providers, have led the declines in this sector.

Intel has been particularly hard hit, with its shares plummeting approximately 29-30% after the chipmaker provided a fourth-quarter revenue forecast of $15-16 billion, falling short of the market's expectations of around $17 billion. Amazon has also contributed to investor anxiety, reporting a negative free cash flow of $42.4 billion over the past year while maintaining its capital expenditure guidance for 2026 at around $220 billion.

Alphabet, the parent company of Google, set a negative tone the day before, with its stock falling over 12% and erasing roughly $500 billion in market value amid concerns about the growth of its search advertising business. This shift in investor expectations reflects a move away from prioritizing revenue growth towards a clearer timeline for profitability, all while facing rising borrowing costs.

Tech Sector Faces Ongoing Volatility Amid AI Spending Challenges

This is not the first instance of significant volatility in the tech sector this year. In June, the market experienced a $1.3 trillion loss over just two days, indicating a pattern of recurring instability rather than isolated incidents. The current trajectory of the Nasdaq 100, which is on track for its worst performance since that June episode, underscores the ongoing challenges associated with AI spending.

AI Investment Concerns Weigh on Major Tech Companies

The struggles of chipmakers like Intel are particularly pronounced, as their fortunes are closely tied to guidance. A weak forecast can lead to immediate repercussions. In contrast, hyperscalers like Amazon may face a slower decline, with the risk that their spending continues to escalate while the anticipated returns remain elusive. Alphabet's decline adds another layer of complexity, as concerns about search advertising suggest that investors are not only questioning AI costs but also the potential disruption of the revenue streams that support these investments.

The S&P 500's 2.08% decline, while less severe than that of the Nasdaq, still reflects the extent to which the broader index is influenced by the same AI-related concerns.